| KO | keep on; keep open; killed organism; knee orthosis; knock out |
|---|---|
| AAO | American Academy of Osteopathy; American Academy of Ophthalmology; American Academy of Optometry; Am... |
| ACO | acute coronary occlusion; alert, cooperative, and oriented; anodal closure odor |
| A&O, A/O | alert and oriented |
| AVPU | alert, verbal, painful, unresponsive [neurologic test] |